An Expedient and Divergent Tandem One-Pot Synthesis of Pyrimidin-2,4-diones Using the Blaise Reaction Intermediate
作者:Yu Sung Chun、Zi Xuan、Ju Hyun Kim、Sang-gi Lee
DOI:10.1021/ol401389j
日期:2013.6.21
A novel divergent tandem one-pot method for the synthesis of 3,5,6-trisubstituted 1H-pyrimidin-2,4-dione derivatives is developed. In the presence of 10 mol % of Cu(OAc)2, the α-substituted Blaise reaction intermediates (R2 ≠ H) reacted with isocyanates chemoselectively to afford pyrimidin-2,4-diones, whereas the α-unsubstituted Blaise reaction intermediate (R2 = H) showed a propensity to be a C-nucleophile
开发了一种新颖的发散串联一锅法,用于合成3,5,6-三取代的1 H-嘧啶-2,4-二酮衍生物。在10 mol%的Cu(OAc)2存在下,α-取代的Blaise反应中间体(R 2 ≠H)与异氰酸酯发生化学选择性反应,得到嘧啶2,4-二酮,而α-未取代的Blaise反应中间体( R 2 = H)显示出对亲电子体倾向于为C-亲核体的趋势,从而允许通过连续的串联反应在5位上安装不同的官能团。